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How to find GMAIL IPs to allow at Firewall

If you are using a Hosting Provider that cares about security, you could have an issue connecting to Gmail's mail servers. They are probably blocking out bound connections over most ports. Which can cause it so that you have to add Gmail's ipaddress to the firewall rules.

How to find Gmail IPs

The first step you are going to want to do is dig for the spf record for gmail.com